Sequestration or Chelation??

[Jakebear]

Stain Free followed up with Metal Free (both Natural Chemistry products) per the directions on the bottle. It was dark till the metal free went in so I don't know if it got cloudy or not. I do know that the stain disappeared almost immediately when the Ascorbic acid hit the water.
We'll see the results in the morning.

The jug of Metal Free said to run the pump 72 hours then change DE (in my case) but I'm wondering how long I should keep the Cl down??? It does not say --- with the rain that we are supposed to get, I'm a bit nervous with it down around 1.5 ppm and CYA ~50. Any thoughts?? Phosphates are <100 so there isn't anything for algae to eat.

[mbar]

After 24 hours and if the stain is gone, you can start to balance the water. Your ph and alkalinity will be probably be low after the ascorbic acid, and you will probably have trouble keeping chlorine in the water. You can get your ph up to 7.2 and then start to add the bleach, add enough to take it up about 2ppms, waiting a little while and adding more until you reach about 4 or 5 for your cya. If you start to see stain forming, make sure your ph is no higher than 7.2 and add more metal free. You should be fine. Just don't shock for at least a week, maybe 2. You can keep your chlorine at the high side for your cya which at 50 would be 6-8ppms, but I wouldn't go higher for the 2 weeks. Feel free to ask any questions you have, good luck

[Jakebear]

The pH was ok this morning (7.5) TA down to 90 but FCl was 0.0 Added a bit of 6% (diluted first in pool water) to bring it up to ~1ppm and threw the robot in to keep stuff stirred up. The water is crystal clear and no apparent sediment on the seams of the liner where it always collects.

Still no rain but they are predicting 4-6 inches around here --- We'll see. I want to get CYA down to ~20 for winter then see where it needs to be for operations next year.

I'll keep you posted on the stains removal process.